Car-sash lock.



W. L. CONWELL.`

CAR SASH LOCK.

APPLICATION FILED OCT. 31 1912.

Patented Apr. 25,191&

mmm

MIE-?Himni A VEIVTOR ATTORIIEV THE COLUMBM PLANDGRAPH C D.. wAsHNu'm D. c.

lUhllU FT T WALTER L. CONWELL, OF UPPER MONTCLAIR, NEW JERSEY, ASSIGNOR TO ACME SUI-'FLY COMPANY, .A CORPOR-ATION OF ILLINOIS.

CAR-SASH IOGK.

Specification of Letters Patent.

lPatented Apr.. 25, 1916..

To all 'whom it may concern:

Be it known that I, WALTER L. CONWELL, a citizen of the United States of America, and a resident of Upper Montclair, Essex County, and State of New Jersey, have invented certain new and useful Improvenents in Car-sash Looks, of which the following is a specification, reference being had to the accompanying drawngs, forming a part thereof.

My invention relates to window sash looks and it has for its object to provide`a simple and durable device of this character that shall be' particularly well adapted for use with car windows and that shall firmly hold the window sash in position except When manually released. i

Other objects and advantages of my invention will be pointed out hereinafter.

In the drawings, Figure 1 is an elevation of a window equipped with locks Constructedin accorclance with my invention. Fig. 2 is an elevation on a larger scale of the lock shown at the left in Fig. l. Fig. 3 is a rear elevation of the lock shown'in Fig. 2. Fig. 4 is a View corresponding to Fg. 3 with the bolt or latch of the lock released. Fig. 5 is a transverse sectional elevation on the line 5-5 of Fig. 4.

Like characters of reference designate corresponding parts in all the figures.

Referring to Figs. 1 to 5 inclusive of the drawings, a window 10 comprises a suitable frame having side members 11 and 12 and a sill 13, an upper sash 14, and a lower sash 15 which is provided with a pair of locks 20-21. The locks 20 and 21 are similar to each other except that one is adapted to be mounted at the left and the other at the right hand side of the sash. The operation of both will be understood from a description of one and consequently I will describe in detail the lock 20 which is fully illustrated in Figs. 3, 4 and 5. With special reference to these figures, the lock here shown comprises a casing 30, having a lateral projecton 31 constituting a finger grip and a substantially rectangular recess 32, a bolt or latch 33 and an actuating lever 34 The bolt or latch 33 is pivotally mounted on a pvot pn 35 near one corner of the recess 32 and is provided with a tongue 36 whch s materially thinner than the body of the bolt and extends between the forks of the yoke lever 34, the adjacent end of which is bifurcated. The lever 34 is pivotally mounted upon a pin 37 near the opposte end of the recess from a bolt, and has a finger grip 38 which extends outwardly through a notch 47 in the casing. It is also` provided with a lateral lug projecton 39 whch has a small boss 40. Another small boss 46 projects from the adjacent wall of the recess, the ends of an -interposed spring 41 being held between these' boss projections. The movement of the lever 34 is limited by a wall 42 of the recess 32 against which it is held by the spring 41. The body of the lock 33 is shaped to provide a cam surface 43 and the tongue 36 is provided with a notch 44 the contour of which corresponds to that of the adjacent cam surface of the bolt. A pin 45 extends laterally through the'two forks of the bifurcated end of the lever 34 and rides in the notch 44, at the same time the adjacent ends of the lever rde on the cam surface 43, 'the two forks of the lever being sufficiently. separated to permit the tongue 36 to fit loosely between them.

The side members 11 and 12 of the window frame are provided with racks or toothed strps '50 and 51, the notches of which are 'adapted to be engaged by the bolts 33 of the looks. The parts of the lock then occupy the positions in which they are illustrated in Fig. 3 of the drawings. The lock may readily be released by forcing the finger grip 38, toward the grip 31, thus swinging the lever 34 on its pivot in opposition to 'the spring 41. The parts are then arranged as shown in Fig. 4. The bolt 33 is wthdrawn from the notch of the rack by theaction of the pin 45 on the cam surface 52 of the notch 44. When the finger grps are released the spring 41 produces a rotative movement of the lever 34 which not only forces the bolt 33 outwardly by reason of the action of the pin 45 on the opposite surface 53 of the notch 44: and by the action of the ends of the lever on the cam surface 43, but also moves the parts into such a position that the bolt is held very securely in its locked position independently of the spring. This is evident from examination of the arrangement of parts in Fig. 3 from which it appears that the cam surfaces 4:3 and 53 are so shaped that the bolt is cramped between the teeth of the rack 50 and the end of the lever 34: which is braced against the Wall of therecess.

As indicated by the broken lines A and B the parts 33 and 34 form a toggle which prevents the displacement of the parts. In fact the downward action of gravity caused by the weight of the sash, acting through the pvots 35 of the two locks and the upward reaction ofthe racks, forms a couple at each side of the sash which tends to Swing the bolt 33 outwardly into a notch of the adjacent rack. There is therefore no tendency for the parts to slip out of position and the spring 4:1 is only relied upon for moving the parts to their locked position and notfor holding them in such position. The advantages of this arrangement are obvious. For example, by locating the looks, one on eachside of the window sash as shown in Fig. 1, the entire sash is held very securely in position when the looks are set, at the same time the locks may be readily released. Such a lock will not rattle even when used upon a railway car.

V Furthermore, the lock comprises a relatively few number of parts and each of them is comparatively simple to construct.

I am aware that various details of construction may be varied through a wide' v range without departing from the principles ofthis invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

' What I claim is:

1. A window lock comprising a casing, a finger grip thereon, a bolt pivotally mounted on the casing, a cam surface on said bolt, a bifurcated lever pivotally mounted in the casing adapted to slidably receive said bolt therein, a finger grip integral with said lever and adapted. to cooperate with the grip on the casing, and said lever adapted to act upon the cam surface of the bolt to prevent movement of the bolt without movement of said lever.

a 2. A window lock comprising a casing, a finger grip thereon, a cam shaped bolt mounted in the casing, atongue of reduced thickness formed on said bolt and having a cam groove therein, a cam shaped shoulder formed on each side of said bolt at the junction of the bolt and tongue, a lever pivg 1,1so,474

otally mounted in the casing, said shoulders curved to conform to the shape of the end of said lever to receive said lever interfitting therein in one position of adjustment of the parts, a finger grip on said lever at one side of its pivot adapted to cooperate with the grip on the casing, the end of said lever at the opposite side of the pivot being bifurcated to receive the tongue of the bolt therein, a pin extending laterally through the bifurcated end of said lever and adapted to run in the cam groove of said tongue, and a spring for moving the lever to position.

3. The combination with a stationary notched member and a movable member adjacent thereto, a lock on the movable member comprising a pivotally supported locking bolt, a projection thereon adapted to engage the notches of said stationary member, cam surfaces on said bolt, a tongue of reduced thickness on said bolt having a recess therein, said surfaces disposed on each side of said bolt at the line of junction of the bolt and tongue, and actuating means adapted to coperate with the recess in said tongue for releasing the bolt and coperating with said recess and with the cam surfaces of the bolt to lock the same firmly in engagement with the notched stationary member.

4. A window lock comprising a pivotally mounted bolt, cam shoulders formed thereon, a tongue of reduced thickness projecting outwardly therefrom and having a cam groove therein, a pivotally mounted actuating lever bifurcated at one end to receive the tongue, a pin on said lever to coperate with the cam groove, the ends of said lever rounded to coperate with the cam surfaces of the bolt, a stop for liniting the rotative movement of the lever in one direction, and means for forcing the lever against the stop, the lever and bolt coperating to wedge the bolt in its locked position when the lever is against said stop.

5. A window lock comprising a casing, a slotted bolt pivot'ally mounted therein, and having a projection thereon adapted to be swung outwardly through an aperture in said casing, a plurality of cam shoulders formed on said bolt, actuating means for said bolt, a spring contacting the actuating means tending to move the bolt to its locked position, said means curved to engage said cam shoulders and adapted to act independently of the spring for holding the bolt in its locked position.

6. The combination of a window lock comprising a casing, a slotted bolt pivotally mounted therein and having a projection adapted to be swung outwardly through a notch in one wall of said casing, cam shoulders formed on said bolt, a spring tending me en hu to move the bolt to its locked position, means independent of the spring curved to engage said cam shoulders for holding the bolt in its locked position, and a pin thereon enmy hand this 30th day of October, 1912, in the presence of two subscrbing witnesses.

WALTER L. CONWELL.

gaged in said slotted bolt adapted to effect Wtnesses: release of the bolt. W. R. HAMILTON,

In Wtness Whereof, I have hereunto set I. C. NITTLER.

Comet of thin pntent may Ibe obtenedl for five sento each, by ndd'essing the nmmnmom, n. e.

commimioner of JPatento, 

